Shock-induced phase transitions in the MgO-FeO system to 200 GPa

被引：17

作者：

Zhang, Li ^{[1
,2
]}

Gong, Zizheng ^{[2
,3
]}

Fei, Yingwei ^{[1
]}

机构：

[1] Carnegie Inst Sci, Geophys Lab, Washington, DC 20015 USA

[2] SW Jiaotong Univ, Inst High Pressure & High Temp Phys, Chengdu 610031, Peoples R China

[3] Beijing Inst Spacecraft Environm Engn, Beijing 100094, Peoples R China

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 2008年 / 69卷 / 09期

基金：

美国国家科学基金会; 中国国家自然科学基金;

关键词：

Oxides; High pressure; Phase transitions;

D O I：

10.1016/j.jpcs.2008.04.006

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We report new shock-compression data for single-crystal MgO at 114 and 192 GPa. Our data together with the existing shock-wave data revealed a volume discontinuity at 170 +/- 10 GPa along with the MgO Hugoniot. The discontinuity gives a volume increase of 1.9%, indicating a possible phase transition from a rock-salt structure (B1) to a high-temperature phase along with the MgO Hugoniot. We re-examined the Hugoniot data on polycrystalline sample (Mg-0.6, Fe-0.4)O up to 200GPa [M.S. Vassiliou, T.J. Ahrens, The equation of state of Mg0.6Fe0.4O to 200 GPa, Geophys. Res. Lett. 9 (1982) 127-130], which showed similar discontinuity with a 2.2% volume increase at 135 +/- 10 GPa. Our results add to fundamental understandings of the behavior of MgO and the lower mantle mineral magnesiowustite (Mg, Fe)O at ultrahigh pressure and temperature. (C) 2008 Elsevier Ltd. All rights reserved.

引用

页码：2344 / 2348

页数：5

共 38 条

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